PRINCE CHARLES is said to have regretted proposing to his late ex-wife Princess Diana just before the wedding – but an unearthed biography revealed a loving note he sent to her the night before their nuptials.

Charles and Diana were famously mismatched as a couple, and are believed to have only met a dozen times before they became engaged in 1981. Lady Diana Spencer appeared to be the perfect consort to Charles on paper. She was from aristocratic circles, ‘intact’, and appeared to share the same passions as the Prince of Wales.

However, after the announcement of their engagement, their relationship started to unravel.

Abruptly thrust into the limelight, Diana began to struggle and could not accommodate life on the royal frontline while many think Charles began to doubt his decision to propose to her.

Yet, according to Howard Hodgson’s 2007 book, ‘Charles: The Man who will be King’, the Prince of Wales was ever supportive of his bride.

He reportedly sent her a note the evening before the wedding which read: “I am so proud of you and when you come up I’ll be there at the altar for you tomorrow.

Lady Diana Spencer was thrust into the spotlight when Charles proposed in 1981 (Image: Getty)

Charles also sent a signet ring with the note to Clarence House, which she wore on her wedding day.

However, different accounts have appeared over the years over whether Charles spent a night with Camilla Parker Bowles in the week leading up to his wedding – implying he was already unfaithful before they exchanged vows.

Two nights before the big day, the Queen threw a dinner for Diana’s family and friends, followed by a huge reception.

Charles and Diana at their wedding rehearsals (Image: Getty)

Camilla and her husband Andrew Parker Bowles were invited to the dance – and they left, together, at the same time while Charles and Diana both retired to their own separate suites.

Yet, as Mr Hodgson explained: “About ten years after her marriage to Prince Charles, [Diana] convinced herself that he had slept with Camilla in Buckingham Palace that night – just 48 hours before his wedding.

“She harboured this imaginary picture in her mind until she finally believed it was true.”

Witnesses have since confirmed this.

Charles allegedly sent Diana a note telling her to ‘knock ’em dead’ before the wedding (Image: Getty)

Charles and Diana sharing their famous kiss on Buckingham Palace’s balcony (Image: Getty)

The following evening – 24 hours before the wedding – Charles hosted a party for his own staff who were not invited to the ball.

Mr Hodgson wrote: “People sympathetic to Diana’s account have since pointed out that Charles and Diana did not sleep under the same roof the next night.”

Diana was staying in Clarence House at the time – which some believe would have given Charles an opportunity to see his former flame.

Yet, the royal biographer claims Charles instead sat up chatting to a close friend, Lady Susan Hussey, who was also amicable with Diana, unable to sleep due to nerves.

Prince and Princess of Wales going on their honeymoon – Diana’s mother said they looked genuinely happy on their wedding day (Image: Getty)

The wedding – which has since been referred to as a “fairytale” – was watched by an estimated global audience of 750 million.

Diana’s mother France Shand Kydd told Hello! Magazine years later, that she never doubted Charles’ feelings for her daughter because of his behaviour at the wedding.

She said: “I think that if anybody does doubt how he originally felt then they should look at the pictures or film of their wedding day.

“I think they really did show genuine happiness and deep affection for each other.”